How to Adjust the Idle on a Hyundai

by Alibaster Smith

The idle on your Hyundai is determined in large part by the throttle cable. The throttle cable is connected to your throttle body and opens and closes the valve on the throttle, allowing more or less air into the throttle. As air is drawn into the throttle, where it mixes with gasoline to produce fuel that can be burned inside the combustion chambers of your Hyundai's engine. To control the idle in your Hyundai, you'll need to adjust the throttle cable.

Step 1

Open the hood and locate the throttle body. If you are standing at the bumper and looking down on the engine bay, it will be on your left. One one end, the throttle is connected to the fuel rail and engine. On the other end it is connected to the air intake. The throttle cable runs off from the throttle body.

Step 2

Locate the throttle adjustment screw. This is actually a nut that is placed inline with the throttle cable that adjusts the tension on the cable. When the tension is too loose, your throttle valve is not opening far enough during idle and you can risk stalling the Hyundai. When the throttle cable is too tight, you are over-revving the engine and are decreasing fuel economy.

Step 3

Turn on the vehicle and check the current idle speed after the vehicle has reached normal operating temperature.

Step 4

Turn the throttle cable adjustment screw clockwise to tighten or counterclockwise to loosen. You should notice the idle adjust as you turn the adjustment screw.

Step 5

Check the tension on the cable. There should be 1/4-inch play in the throttle cable. This should produce an idle speed of about 800 RPM. Your RPM range at idle should not drop below 500 RPM and should not rise above 1,000 RPM once the vehicle has reached normal operating temperature.

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